linux/pt: include missing linux/perf.h - closes #534

linux/bfd.c

diff --git a/linux/bfd.c b/linux/bfd.c
index 1ad3ec3..99db227 100644
--- a/linux/bfd.c
+++ b/linux/bfd.c
@@ -834,9 +834,9 @@
         }
 
         uint8_t* buf = util_Malloc(sz);
-	defer {
-		free(buf);
-	};
+        defer {
+            free(buf);
+        };
         if (!bfd_get_section_contents(bfdh, sec, buf, 0, sz)) {
             LOG_W("bfd_get_section_contents('%s') failed", name);
             continue;

linux/pt.c

diff --git a/linux/pt.c b/linux/pt.c
index dc7a94a..1d7b410 100644
--- a/linux/pt.c
+++ b/linux/pt.c
@@ -30,6 +30,7 @@
 #include "libhfcommon/common.h"
 #include "libhfcommon/log.h"
 #include "libhfcommon/util.h"
+#include "linux/perf.h"
 
 #ifdef _HF_LINUX_INTEL_PT_LIB